In pics: 2017 U.S. Open on day 7

Garbine Muguruza of Spain returns a ball to Petra Kvitova of Czech Republic during the women's singles fourth round match at the 2017 U.S. Open in New York, the United States, Sept. 3, 2017. Garbine Muguruza lost 0-2. (Xinhua/Wang Ying)